<html><head></head><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px"><div dir="ltr" id="yui_3_16_0_ym19_1_1486863498741_29620"><span>WOW!</span></div><div dir="ltr"><span>Rig</span></div><div dir="ltr" id="yui_3_16_0_ym19_1_1486863498741_29621"><span><br></span></div> <div class="qtdSeparateBR"><br><br></div><div class="yahoo_quoted" style="display: block;"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div dir="ltr"><font size="2" face="Arial"> On Saturday, February 11, 2017 6:51 PM, Michael E Caloroso <mec.forumreader@gmail.com> wrote:<br></font></div> <br><br> <div class="y_msg_container">Using info pulled from the AH archives, I emulated the Solina chorus<br clear="none">ensemble effect successfully on my Korg SDD-3300. Square waves from a<br clear="none">top octave combo organ system through a highpass filter (resulting in<br clear="none">a narrow pulse) completes the emulation.<br clear="none"><br clear="none">Variations of that string ensemble effect can result in wonderful<br clear="none">choir ensemble effects.<br clear="none"><br clear="none">MC<br clear="none"><div class="yqt7888458365" id="yqtfd32112"><br clear="none">On 2/11/17, bill bigrig <<a shape="rect" ymailto="mailto:billbigrig@yahoo.com" href="mailto:billbigrig@yahoo.com">billbigrig@yahoo.com</a>> wrote:<br clear="none">> On the Solina, have you seen or heard about Jurgen Haile triple chorus PCB?<br clear="none">> It would give you some reference if you look it up.Rig<br clear="none">><br clear="none">> On Saturday, February 11, 2017 10:06 AM, "<a shape="rect" ymailto="mailto:sleepy_dog@gmx.de" href="mailto:sleepy_dog@gmx.de">sleepy_dog@gmx.de</a>"<br clear="none">> <<a shape="rect" ymailto="mailto:sleepy_dog@gmx.de" href="mailto:sleepy_dog@gmx.de">sleepy_dog@gmx.de</a>> wrote:<br clear="none">><br clear="none">><br clear="none">><br clear="none">> right, but no I won't forget that, it's on the list (and implementation<br clear="none">> ideas) :-)<br clear="none">> And the percussion mode of course, is also on the list. That definitely<br clear="none">> adds some of the sound characteristic.<br clear="none">><br clear="none">> - Steve<br clear="none">><br clear="none">> Am 11.02.2017 um 17:09 schrieb bill bigrig:<br clear="none">><br clear="none">> don't forget key click. Rig<br clear="none">><br clear="none">> On Saturday, February 11, 2017 7:29 AM, Tom Wiltshire<br clear="none">> <<a shape="rect" ymailto="mailto:tom@electricdruid.net" href="mailto:tom@electricdruid.net">tom@electricdruid.net</a>> wrote:<br clear="none">><br clear="none">><br clear="none">><br clear="none">> On 11 Feb 2017, at 14:08, Gordonjcp <<a shape="rect" ymailto="mailto:gordonjcp@gjcp.net" href="mailto:gordonjcp@gjcp.net">gordonjcp@gjcp.net</a>> wrote:<br clear="none">><br clear="none">> > On Sat, Feb 11, 2017 at 11:42:18AM +0000, Tom Wiltshire wrote:<br clear="none">> >><br clear="none">> >> On 11 Feb 2017, at 11:03, Gordonjcp <<a shape="rect" ymailto="mailto:gordonjcp@gjcp.net" href="mailto:gordonjcp@gjcp.net">gordonjcp@gjcp.net</a>> wrote:<br clear="none">> >><br clear="none">> >>> What you absolutely must do is ensure that all the notes you generate<br clear="none">> start in phase.<br clear="none">> >> <snip><br clear="none">> >>> This is something you'd need to do on a tonewheel emulation, too.<br clear="none">> >><br clear="none">> >><br clear="none">> >> Why? The Hammond tone generator is free-running and the pitches are fed<br clear="none">> straight to the busbars. While the frequencies themselves might have a fixed<br clear="none">> phase relationship, it's not related to note onset in any way.<br clear="none">> >><br clear="none">> >> Or am I misunderstanding what you meant?<br clear="none">> >><br clear="none">> ><br clear="none">> > Okay, pull out the 8' bar and play C3. Holding that down, play C4, on<br clear="none">> and off a few times. You'll hear it key on and off, great.<br clear="none">> ><br clear="none">> > Now pull out the 4' bar as well, and play C4 again. What's the phase<br clear="none">> relationship between the fundamental of C4 and the 4' stop of C3? Can you<br clear="none">> see a situation where you might end up with the two cancelling?<br clear="none">> ><br clear="none">> > If you were generating all 91 tones, you'd just be gating them on and<br clear="none">> off. But in a typical software synth you'd generate each voice individually<br clear="none">> with fixed polyphony. If you're not careful with it you could easily end up<br clear="none">> with some notes out of phase with others and odd random shifts in tone<br clear="none">> colour as a result.<br clear="none">><br clear="none">> Aaah! Yes, ok, absolutely! I see what you mean. Thanks Gordon.<br clear="none">><br clear="none">> This is a very good point he's making - since the Hammond uses the same<br clear="none">> tone generator for every/any note, there's no danger of phase cancellation.<br clear="none">> The same is true in the TOG organs/synths. Any "voice based" implementation<br clear="none">> needs to ensure that it copies this effect. This isn't too difficult if all<br clear="none">> the voices are produced on the same DSP, but it makes processor-per-voice<br clear="none">> implementations a bit awkward to do.<br clear="none">><br clear="none">> I'd be inclined to run NCOs simulating the correct Hammond pitches for the<br clear="none">> driving/driven gear combinations, and then use shifted versions of the phase<br clear="none">> accumulator to generate the waveform indexes for the required number of<br clear="none">> octaves. With only a dozen notes, that's not a lot of work.<br clear="none">> To adjust the pitches for the standard TOG division frequencies would then<br clear="none">> be a case of tweaking the twelve frequency increments.<br clear="none">><br clear="none">> Tom<br clear="none">><br clear="none">><br clear="none">><br clear="none">><br clear="none">> _______________________________________________<br clear="none">> Synth-diy mailing list<br clear="none">> <a shape="rect" ymailto="mailto:Synth-diy@synth-diy.org" href="mailto:Synth-diy@synth-diy.org">Synth-diy@synth-diy.org</a><br clear="none">> <a shape="rect" href="http://synth-diy.org/mailman/listinfo/synth-diy" target="_blank">http://synth-diy.org/mailman/listinfo/synth-diy</a><br clear="none">><br clear="none">><br clear="none">><br clear="none">><br clear="none">> _______________________________________________<br clear="none">> Synth-diy mailing list<br clear="none">> <a shape="rect" ymailto="mailto:Synth-diy@synth-diy.org" href="mailto:Synth-diy@synth-diy.org">Synth-diy@synth-diy.org</a><br clear="none">> <a shape="rect" href="http://synth-diy.org/mailman/listinfo/synth-diy" target="_blank">http://synth-diy.org/mailman/listinfo/synth-diy</a><br clear="none">><br clear="none">><br clear="none">><br clear="none">> _______________________________________________<br clear="none">> Synth-diy mailing list<br clear="none">> <a shape="rect" ymailto="mailto:Synth-diy@synth-diy.org" href="mailto:Synth-diy@synth-diy.org">Synth-diy@synth-diy.org</a><br clear="none">> <a shape="rect" href="http://synth-diy.org/mailman/listinfo/synth-diy" target="_blank">http://synth-diy.org/mailman/listinfo/synth-diy</a><br clear="none">><br clear="none">><br clear="none">></div><br><br></div> </div> </div> </div></div></body></html>